. Nature and development of plants. Botany. 2^.8 REDUCED ASCOMYCETES 92A. Order g. Exoascales or PeacTi Ctirl.—This group in- cludes a small number of parastic fungi that are especially destruc- tive to peach and plum trees, causing distortion of the leaves and fruit, known as leaf curl and bladder plum (Fig. 159). There is apparently no trace of a reproductive process, the mycelium spreading through the leaf develops directly a rudimentary hymenium of numerous asci beneath the cuticle, which is finally. Fig. 159. Fig. 160. Fig. 159. A branch from peach tree, showing the distortion of the leav
. Nature and development of plants. Botany. 2^.8 REDUCED ASCOMYCETES 92A. Order g. Exoascales or PeacTi Ctirl.—This group in- cludes a small number of parastic fungi that are especially destruc- tive to peach and plum trees, causing distortion of the leaves and fruit, known as leaf curl and bladder plum (Fig. 159). There is apparently no trace of a reproductive process, the mycelium spreading through the leaf develops directly a rudimentary hymenium of numerous asci beneath the cuticle, which is finally. Fig. 159. Fig. 160. Fig. 159. A branch from peach tree, showing the distortion of the leaves caused by the fungus, Exoascus. Fig. 160. Section of a leaf showing numerous cells rupturing the cuticle and developing into asci, as. ruptured by their growth (Fig. 160). The ascospores are dis- charged into the air by the bursting of the asci and carried by the wind to other plants. The damage in the United States to peach trees alone is estimated at $2,000,000 to $3,000,000 annually. 93. Order h. Yeast or Saccharomycetes.—^These fungi are unicellular plants with little suggestion of mycelial growths Ordinarily they consist of rather oval cells which multiply rapidly by a budding suggestive of conidia formation in preceding orders (Fig. 161). The new cells that push out from the side of the mother cell readily drop off, but in rapid growth they may remain attached in chains (Fig. 161, D). Under certain condi- tions, as the exhaustion of the food supply, the cells become transformed into asci and the contents of each cell rounds off into one or more ascospores (Fig. 161, E). The ascospores are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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